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Date:   Mon, 10 Jul 2023 18:56:56 +0100
From:   Conor Dooley <conor@kernel.org>
To:     Rob Herring <robh@kernel.org>
Cc:     Mauro Carvalho Chehab <mchehab@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Todor Tomov <todor.too@gmail.com>, linux-media@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] media: dt-bindings: Convert Omnivision OV7251 to DT
 schema
Message-ID: <20230710-underling-angelfish-c47d363a59f5@spud>
References: <20230707210646.868758-1-robh@kernel.org>
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On Fri, Jul 07, 2023 at 03:06:46PM -0600, Rob Herring wrote:
> Convert the OmniVision OV7251 Image Sensor binding to DT schema format.
>=20
> vddd-supply was listed as required, but the example and actual user
> don't have it. Also, the data brief says it has an internal regulator,
> so perhaps it is truly optional.

ov7251.c:
	ov7251->core_regulator =3D devm_regulator_get(dev, "vddd");
	if (IS_ERR(ov7251->core_regulator)) {
		dev_err(dev, "cannot get core regulator\n");
		return PTR_ERR(ov7251->core_regulator);
	}

Looks like the driver's probe function disagrees?
I was going to ask how it worked, but the one user has
status =3D "disabled"...

/shrug, what's here looks fine to me, whatever Qualcomm person cares
about the driver can make sure it works for them I guess.

Reviewed-by: Conor Dooley <conor.dooley@microchip.com>

Cheers,
Conor.

>=20
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
>  .../devicetree/bindings/media/i2c/ov7251.txt  |  52 ---------
>  .../bindings/media/i2c/ovti,ov7251.yaml       | 105 ++++++++++++++++++
>  2 files changed, 105 insertions(+), 52 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/media/i2c/ov7251.txt
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/ovti,ov72=
51.yaml
>=20
> diff --git a/Documentation/devicetree/bindings/media/i2c/ov7251.txt b/Doc=
umentation/devicetree/bindings/media/i2c/ov7251.txt
> deleted file mode 100644
> index 8281151f7493..000000000000
> --- a/Documentation/devicetree/bindings/media/i2c/ov7251.txt
> +++ /dev/null
> @@ -1,52 +0,0 @@
> -* Omnivision 1/7.5-Inch B&W VGA CMOS Digital Image Sensor
> -
> -The Omnivision OV7251 is a 1/7.5-Inch CMOS active pixel digital image se=
nsor
> -with an active array size of 640H x 480V. It is programmable through a s=
erial
> -I2C interface.
> -
> -Required Properties:
> -- compatible: Value should be "ovti,ov7251".
> -- clocks: Reference to the xclk clock.
> -- clock-names: Should be "xclk".
> -- clock-frequency: Frequency of the xclk clock.
> -- enable-gpios: Chip enable GPIO. Polarity is GPIO_ACTIVE_HIGH. This cor=
responds
> -  to the hardware pin XSHUTDOWN which is physically active low.
> -- vdddo-supply: Chip digital IO regulator.
> -- vdda-supply: Chip analog regulator.
> -- vddd-supply: Chip digital core regulator.
> -
> -The device node shall contain one 'port' child node with a single 'endpo=
int'
> -subnode for its digital output video port, in accordance with the video
> -interface bindings defined in
> -Documentation/devicetree/bindings/media/video-interfaces.txt.
> -
> -Example:
> -
> -	&i2c1 {
> -		...
> -
> -		ov7251: camera-sensor@60 {
> -			compatible =3D "ovti,ov7251";
> -			reg =3D <0x60>;
> -
> -			enable-gpios =3D <&gpio1 6 GPIO_ACTIVE_HIGH>;
> -			pinctrl-names =3D "default";
> -			pinctrl-0 =3D <&camera_bw_default>;
> -
> -			clocks =3D <&clks 200>;
> -			clock-names =3D "xclk";
> -			clock-frequency =3D <24000000>;
> -
> -			vdddo-supply =3D <&camera_dovdd_1v8>;
> -			vdda-supply =3D <&camera_avdd_2v8>;
> -			vddd-supply =3D <&camera_dvdd_1v2>;
> -
> -			port {
> -				ov7251_ep: endpoint {
> -					clock-lanes =3D <1>;
> -					data-lanes =3D <0>;
> -					remote-endpoint =3D <&csi0_ep>;
> -				};
> -			};
> -		};
> -	};
> diff --git a/Documentation/devicetree/bindings/media/i2c/ovti,ov7251.yaml=
 b/Documentation/devicetree/bindings/media/i2c/ovti,ov7251.yaml
> new file mode 100644
> index 000000000000..8d939858d950
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/ovti,ov7251.yaml
> @@ -0,0 +1,105 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/i2c/ovti,ov7251.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: OmniVision OV7251 Image Sensor
> +
> +description:
> +  The Omnivision OV7251 is a 1/7.5-Inch CMOS active pixel digital image =
sensor
> +  with an active array size of 640H x 480V. It is programmable through a=
 serial
> +  I2C interface.
> +
> +maintainers:
> +  - Todor Tomov <todor.too@gmail.com>
> +
> +properties:
> +  compatible:
> +    const: ovti,ov7251
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    description: XCLK Input Clock
> +
> +  clock-names:
> +    const: xclk
> +
> +  clock-frequency:
> +    description: Frequency of the xclk clock in Hz.
> +
> +  vdda-supply:
> +    description: Analog voltage supply, 2.8 volts
> +
> +  vddd-supply:
> +    description: Digital core voltage supply, 1.2 volts
> +
> +  vdddo-supply:
> +    description: Digital I/O voltage supply, 1.8 volts
> +
> +  enable-gpios:
> +    maxItems: 1
> +    description:
> +      Reference to the GPIO connected to the XSHUTDOWN pin, if any. Pola=
rity
> +      is GPIO_ACTIVE_HIGH.
> +
> +  port:
> +    description: Digital Output Port
> +    $ref: /schemas/graph.yaml#/$defs/port-base
> +    additionalProperties: false
> +
> +    properties:
> +      endpoint:
> +        $ref: /schemas/media/video-interfaces.yaml#
> +        unevaluatedProperties: false
> +
> +        properties:
> +          clock-lanes:
> +            maximum: 1
> +
> +          data-lanes:
> +            maxItems: 1
> +
> +        required:
> +          - data-lanes
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - vdddo-supply
> +  - vdda-supply
> +  - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    i2c {
> +        #address-cells =3D <1>;
> +        #size-cells =3D <0>;
> +
> +        camera@3c {
> +            compatible =3D "ovti,ov7251";
> +            reg =3D <0x3c>;
> +            clocks =3D <&clks 1>;
> +            clock-frequency =3D <24000000>;
> +            vdddo-supply =3D <&ov7251_vdddo_1v8>;
> +            vdda-supply =3D <&ov7251_vdda_2v8>;
> +            vddd-supply =3D <&ov7251_vddd_1v5>;
> +            enable-gpios =3D <&gpio1 19 GPIO_ACTIVE_HIGH>;
> +
> +            port {
> +                ov7251_ep: endpoint {
> +                    remote-endpoint =3D <&csi0_ep>;
> +                    clock-lanes =3D <1>;
> +                    data-lanes =3D <0>;
> +                };
> +            };
> +        };
> +    };
> +...
> --=20
> 2.40.1
>=20

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